Conduit fastener



Feb. 9, 1943. H R, ELLINWOQD 2,310,622

CONDUIT FASTENER Original Filed Sept. 25, 1940 ermazzayZZ/Izlbwd Patented Feb. 19, 1943 UNITED". STATES PATENT OFI-ice y coNDUl'T rFAs'rENEa Herman Ray Ellinwood, Hollywood, Calif., assignor to Adel Precision Products Corp., a corporationof California rginal application September 25, 1940, Serial Divided and this application September 29, 1941, Serial No. 412,79

9 claims. ((1174-40) The present invention relates to an improved conduitrfastener or clip of the type shown in the patent toPaul W. Adler, Number 2,215,283,

issued September 17, 1940. This application is a division of my application Serial Number 358,366 iiled September 25, 1940.

The primary purpose of the present inventionV is to provide a clip or fastener of thel character describedin which a metallic conduit embracing strap, a rubber or similar cushion, and a metallic grounding strip are so constructed and relativelyto provide a clip of the character described in which the conduit embracing portion or the metallic strap is of channelled cross section and the cushion is either made to lie and be held in the channel of such portion or itself formed with a channel for receiving the conduit embracing portion of the strap whereby in either case the flanges or sides of the channelled portion will retain the cushion'strap and 'groundingstrip in a predetermined overlapping relation regardless of the aforesaid relative movement and dislodgment tendency resulting from vibratory and.

other stresses.

-Another purpose of this invention is to provide a conduit anchorage device of the character describedin which the full cushioning action of a cushioning member arranged between the strap and the conduit is afforded while said member is compressed between the strap land conduit and without causing the dislodgment of the cushion' Afrompredetermined position relative to the strap and conduit or interfering with an effective electrical contact of the grounding strip with the conduit' and strap A further purpose of this invention is to provide a conduit clip of the character described wherein the metallic grounding'strip is associated with the cushion as by being carried in nonten sloned condition thereon and is presented thereby so as to'maintain electrical contact of the maximum portion thereof with the strap and' conduit, and thereby insure a reliable grounding of the conduit and at the same rtime provide adequate cushioning of the latter, said strip and cushion being capable of relative movement without impairment of their respective functions,

due to manner of. constructing the strip and cushion and the relative arrangement thereof.

Another purp'ose of this invention is the provision of a clip such as described in which the metallic grounding strip is mounted on the rubber or like cushion member in such manner that considerable saving in time and laboris effected in assembling the cushion strip unit.

With the foregoing objects in view, together i with such other, objects and advantages as may subsequently appear, the invention is carried into effect as illustrated by way of example in the accompanying drawing, in which Fig. 1 is a fragmentary perspective view of a clip embodying my invention;

Fig. 2 is a vertical sectional view ofthe clip;

Fig. 3 is a cross sectional view taken on the line 3- 3 of Fig. 1;

Fig. 4 is an enlarged fragmentary longitudinal section showing themanner in which the ground- Aing strip contacts the conduit and the metal strap;

- Fig. 5 is Aa perspective view of a modified form of the invention;

Fig. 6 is a vertical section of the clip shown in Fis. 5;

Fig. 7 is a cross sectional view showing the manner in which the cushion and grounding strip engage the metal strap and the conduit;

Fig. 8 is a cross sectional view taken on the line 88 of Fig. 6.

One embodiment of this invention las shown y in Figs. 1 to 4 inclusive of the accompanying drawing comprises a bendable resilient metal strap member A havingan arcuate loop portion l for embracing a metallic pipe or conduit line B and provided with apertured terminals 2 and adapted to Abe secured by means of a screw 3 or other fastening ,to and electrically contacted with a metallic structure (Fig. 1) which forexample is a structural part C of an airplane or the like.

On the inner periphery of the loop portion l is an elongated soft rubber or similar resilient cushion member 4 which substantially surrounds and, affords a cushioned-support for the conduit, and has associated therewith in the particular manner of this invention ametallic grounding strip 5 arranged to contact the con;

. duit andthe strap respectively whereby the conduit will be grounded tothe structure C through' the strap prevent dangerous static discharges.

As here provided the strap A is of chanelled cross section so that the concave side thereof and theanges B along its edges are on the inner side of the strap. The cushion l is of substantially rectangular-'cross section and-fits snugly inthe channel formed between the flanges 6 so that it will be `,effectively held for engaging thev conduit line B, as shown in Fig 3. The flanges 6 extend at right angles to the loop portion I vand therefore prevent displacement of the cushion.

If desired the cushion may be glued or other-v wise similarly adhered or secured to the loop I and is preferablyltted between the flanges 6 so as to be compressed and put under tension whereby to assist in the retention thereof on the strap.

latter will not be impaired yet the strip yieldably held by the cushion in good contact with the strap and conduit and conduit line.

The portions of the helically wound strip 5 crossing the longitudinal edges of the cushion will contact the flanges 6 on the loop portion I as additional grounding connection -between the strap and the strip.

mation and arrangement as come within the purview of the appended claims. s

I claim: v

. 1. In a clip for supporting a metallic conduit line on andl electrically grounding it to a metallic support," fa v metallic 5line"embracing strap, a resilient line embracing cushion of insulation material, means embodied in the strap for retaining said cushion in position lining said strap anda metallic grounding strip Wound -around said cushion between the ends of the cushion soas to present a portion for contacting the conduit line and a portion'in contact with the strap.

2. In a clip for supporting a metallic conduit line on and electrically grounding it to a metallic supporta metallic line embracing strap, a resilient line embracing cushion of insulation material carried by said strap, and a metallic grounding` strip Wound helically around said cushion so as to present a portion for contactingv the conduit line and a portion in contact with the strap, said strap having inwardly extending marginal iianges with which a portion of the grounding strip is engaged.

3. In a clip for supporting a metallic conduit line on and electrically grounding it to a metallic support, a metallic line embracing strap, a resilient line embracing cushion of insulation material carried by said strap, and a metallic grounding strip Wound helically around said i cushion so as to present a portion for contacting 'The helical winding of thestrip 5 around the cushion from `end to end makes for a quick and easy assembly of the cushion and strip as aunit and aords a'maximum of contacting surfaces for engaging the conduit and strap.

A modied form of my invention shown inV Figs. 5 to 8, inclusive, includes a bendable resilient metal strap 9 for embracing a conduit line, a resilient cushion I0 of soft-rubber or the like supported on the strap, a metallic grounding strip II carriedby the cushion apertured terminals vI2 on the strap and a: fastening I3 for securing the conduit line and a portion in contact with the strapg said cushion being of substantially rectangular cross section, said strap being of chanlnelled cross section to retain the cushion in the channel thereof. f

4. In a clip for supporting a'metallic conduit line on and electrically grounding it to av metallic support, a metallic line embracing strap, a resilthe strap to a metallic structure I4. The line embracing portion o1' the-strap 9 is semi-circular in cross section with its concave side innermost 'and the cushionf I0 is of circular Across section and lits snugly in and conforms to the channel I5 formed in the strap. The'metallic strap Il is wound helically around the cushion from end to end and provides a plurality of segments (or portions which eiectively contact the strap and conduit line to groundthe latter to the metal structux-e I4; The sidesot to hold the cushion and strip unit in place. If desired the cushion may be cemented or otherwise adhered to the strap.

As shown in Fig. 7 the cushion is compressed so that the conduit engaging thereof is flattened when the strap is tightly secured around the conduit whereby to eiectively hold the grounding strip in good contact with the conduit.A The circular crosssection oi' the cushion aiords a full cushioning action.and a close conformation land'ngritact' of the strip, withrespect to vthgstraplgwuliefso msurmg't'he retention of the cushion in place on the straps While I have shown 'and described 'a `specific eibodimentofmyinvention I do not limit myself tothe -detausof wan-,set forth, and

tionsandgequivalents of the parts and their forthecha'nnel act as ilanges f 'the invention-estantes suer'lr-tritata,lV modmcaient line embracing cushion of insulation matet rial carried by said strap, a metallic grounding strip wound vhelically around said cushion so as to present a portion for contacting-'the conduit line and a' portion in contact with the strap, and marginal anges on said strap opposed to and contacting longitudinal edges of the cushion also the portions of said grounding strip which overlies said edges.

5. In a clip for supporting a metallic conduit line on and electrically grounding it to a metallic support. a. metallic line embracing strap, a resilient line embracing cushion of insulation material carried by said strap, and a metallic grounding strip wound helically around said cushionl'so as to' present a portion for contacting the conduit .line anda portion in 'contact with the strap, said-cushion-being of substantially circular cross section, said strap having an arcuate channel therein in which the cushionis retained.

6. In a clip for supportingfa metallic conduit line on and electrically grounding it to a metallic support, a metalliclineembracing strap.l a resilient line embracing cushion-of `insulation material carried said strap. and a metallic grounding strip w d helically around said cushion so as to present a portion for contacting the conduit line and a portion in contact with the strap, said cushion being of substantially circular cross sectionusaid strap having marginal flanges between which said cushion is engaged and with which said strip is, contacted. j

-'7. yIn a clip for supporting a metallic conduit line on land electrically grounding it to a metallic supporta'metallic lineeinbracing' strap, a resilient line-` embracing .cushion of unsulation material carried by said strap, and a metallic grounding strip Wound helically around said cushion so as to present a portion for contacting the conduit line and a portion in contact with the strap, said strap being of substantially semi-circular cross section and said cushion being of substantially circular cross section and fitting in the concave side of the strap.

8. In a clip for supporting a metallic conduit line on and electrically grounding it to a metallic support, a metallic line embracing strap, a resilient line embracing cushion of substantially circular cross section, said strap havingI marginal flanges between which the cushion is engaged and a metallic grounding strip carried by said cushion and held thereby in contact With the strap and in position to contact the conduit line.

9. In a clip for supporting a metallic conduit line on and electrically grounding it to a metallic support, a metallic line embracing strap member having terminals adapted to be secured to the metallic support, a compressible resilient line embracing cushion member carried on the strap member, a metallic flexible grounding strip wound around said cushion member between the ends thereof to provide on the opposite faces thereof a. plurality of strip portions for contacting the strap member and the conduit line, and marginal flanges on said strap for engaging and retaining the cushion thereon.

HERMAN RAY ELLrNWoOD. 

